Plants require calcium, magnesium, nitrogen, phosphorous,
potassium and sulfur in relatively large amounts (>0.1% of dry
mass) and each of these so-called macronutrients is essential
for a plant to complete its life cycle. Normally, these minerals
are taken up by plant roots from the soil solution in ionic form
with the metals Ca2+, Mg2+ and K+ present as free cations, P
and S as their oxyanions phosphate (PO4
3) and sulfate (SO4
2)
and N as anionic nitrate (NO3
) or cation ammonium
(NH4
+
).Recently, important progress has been made in
identifying transport and regulatory mechanisms for
macronutrients and the mechanisms of uptake and
distribution. These and the main physiological roles of each
nutrient will be discussed.
A
Plants require calcium, magnesium, nitrogen, phosphorous,potassium and sulfur in relatively large amounts (>0.1% of drymass) and each of these so-called macronutrients is essentialfor a plant to complete its life cycle. Normally, these mineralsare taken up by plant roots from the soil solution in ionic formwith the metals Ca2+, Mg2+ and K+ present as free cations, Pand S as their oxyanions phosphate (PO43) and sulfate (SO42)and N as anionic nitrate (NO3) or cation ammonium(NH4+).Recently, important progress has been made inidentifying transport and regulatory mechanisms formacronutrients and the mechanisms of uptake anddistribution. These and the main physiological roles of eachnutrient will be discussed.A
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